Toán Lớp 6: Tính hợp lí nếu có thể:
a, ( -423 ) – ( 358 – 123 ) + ( 34 – 542 )
b) 26 . 394 + ( -26 ) . 37 – 43 . ( -26 )
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Toán Lớp 6: Tính hợp lí nếu có thể:
a, ( -423 ) – ( 358 – 123 ) + ( 34 – 542 )
b) 26 . 394 + ( -26 ) . 37 – 43 . ( -26 )
Comments ( 2 )
=(-423)-358+123+34-542
=(-423+123)-(358+542)+34
=-300-900+34
=-1200+34
=-1166
=(-26).(-394)+(-26).37-43.(-26)
=(-26)(-394+37-43)
=(-26).(-400)
=10400